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Mechanical resistance of flexion strength of fixation methods for angle fractures in mandible polyurethane.

Grant number: 11/19737-8
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2012
Effective date (End): June 30, 2014
Field of knowledge:Health Sciences - Medicine - Surgery
Principal Investigator:Luis Augusto Passeri
Grantee:Jose Luis Munante Cardenas
Host Institution: Faculdade de Ciências Médicas (FCM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil


The mandibular angle fractures have a high incidence being the young adult and economically active population the mainly affected. Although there is consensus on the need of open reduction and stable internal fixation of these fractures, there is still controversy about which is the best system of fixation or the technique that should be used. Thus, different fixation models have been described and reported in the literature, with widely varying and controversial results. A main subject of the discussion is about the need to use one or two plates for fixation. The installation of a single plate is the preferred technique by most of the surgeons, followed by the installation of two plates. On the other hand, 3D plates - though little used today - are gaining ground very quickly due to their excellent biomechanical results and low rates of post operative complications. However, there is still little information available about the mechanical and clinical behavior of 3D systems.Therefore, the objective of this study is to evaluate and to compare, in vitro, through biomechanical tests, the mechanical resistance of flexion strength of stable internal fixation methods for mandibular angle fractures. A sample of 50 replicates of human mandibles made of polyurethane will be used and subjected to linear loading, being 10 Integer jaws for substrate control test, and four groups of 10 jaws, with the simulation of angle fracture. The plates and screws, all of systems of 2.0 mm, will be installed according to the following provisions: a) a straight titanium plate, 4 holes, conventional, kept in the mandibular external oblique line, using four monocortical screws of 5 mm b) two straight titanium plate, 4 holes each one, conventional, installed the first one in a tension zone maintained by 4 monocortical screws of 5 mm, and the second one installed in the compression zone, maintained through 4 bicortical screws of 13 mm in length c) a 3D titanium plate, 4 holes, maintained with 4 monocortical screws of 5 mm in length and d) a 3D titanium plate, 8 holes, maintained with 8 monocortical screws of 5 mm in length.

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
CARDENAS, Jose Luis Munante. Epidemiology of mandibular fractures and mechanical evaluation of fixation methods of angle fractures in polyuretane mandibles. 2014. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Faculdade de Ciências Médicas Campinas, SP.

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